Abstract
Non-oxide ceramic matrix composites (CMCS) in the system Mo-Si-B-C were formed by a reactive pressureless melt infiltration process at 1450°C and 1800°C, respectively. For the high temperature process a porous preform of pure boron carbide powder was infiltrated by a silicon melt containing 8 mol% of molybdenum. For the low temperature process, however, a mixture of boron carbide and molybdenum powder (1:1.5) was used as the preform to be infiltrated by a pure silicon melt. The fully dense reacted matrix materials are composed of MoSi 2 , SiC, boron carbide solid solutions. minor amounts of molybdenum- and silicon-borides and residual free silicon. The bending strength was 130 - 170 MPa, a Young's modulus of 300 GPa and a Vicker's hardness of 20 GPa were obtained.
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